Log scheduled mode-sync transitions and the override-skip path

INFO-logs the scheduled check-in (next::start) and check-out
(current::end) times/guest when arming mode-sync handles, and
DEBUG-logs when scheduling is skipped because an override has
Active parked.

custom_components/room_cal_ha/coordinator.py

@@ -282,6 +282,7 @@ class RoomCalCoordinator(DataUpdateCoordinator[CoordinatorData]):
     # Those are re-armed automatically once the override ends and _async_publish()
     # calls back into this method with override cleared.
     if self._override is not None:
+      _LOGGER.debug("Reschedule skipped: override active, active is parked")
       return
 
     now = dt_util.now().replace(tzinfo=None)
@@ -292,6 +293,7 @@ class RoomCalCoordinator(DataUpdateCoordinator[CoordinatorData]):
       check_in = datetime.combine(nxt.check_in_date, nxt.check_in_time)
       delay = (check_in - now).total_seconds()
       if delay > 0:
+        _LOGGER.info("Scheduled update: next::start at=%s guest=%s", check_in, nxt.guest_name)
         self._mode_sync_handles.append(
           async_call_later(self.hass, delay, self._async_handle_check_in)
         )
@@ -301,6 +303,7 @@ class RoomCalCoordinator(DataUpdateCoordinator[CoordinatorData]):
       check_out = datetime.combine(active.check_out_date, active.check_out_time)
       delay = (check_out - now).total_seconds()
       if delay > 0:
+        _LOGGER.info("Scheduled update: current::end at=%s guest=%s", check_out, active.guest_name)
         self._mode_sync_handles.append(
           async_call_later(self.hass, delay, self._async_handle_check_out)
         )